Patents by Inventor Tamotsu Harihara
Tamotsu Harihara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7149599Abstract: When creating other tool path from two tool paths for cutting a work accurately and efficiently, the data on the first tool path is composed of a position vector and a direction vector of a tool for use when the work is cut while moving the tool. The data on the second tool path is composed of a position vector and a direction vector of the tool for use when the work, which has been cut according to the first tool path, is further cut. A computer uses the first tool path data and second tool path data to calculate a position vector and a direction vector of a medium tool path that is between the first tool path and second tool path.Type: GrantFiled: February 28, 2005Date of Patent: December 12, 2006Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.Inventors: Hiroshi Arai, Junichi Hirai, Tamotsu Harihara, Osamu Chiba, Nobuhisa Kanamaru, Shunsuke Minami
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Patent number: 6999845Abstract: A numerically controlled curved-surface machining unit equipped with three linearly moving axes and, at least, one rotary axis, including a simultaneous multiple-axis control NC machine numerically controlled by a numerical control unit with a numerical control NURBS interpolation function. The unit enables reading, as CL (cutter location) data, tool control point vector data and tool axis vector data, along a machining direction on a workpiece coordinate system for a curved surface, obtaining feed rates therefor, and calculation by conversion of the CL data into position vectors of three linear axes on a machine coordinate system, rotation angles and feed rates on the machine coordinate system so as to operate the simultaneous multiple-axis control NC machine on the basis of a machine configuration of the simultaneous multiple-axis control NC machine.Type: GrantFiled: October 19, 2004Date of Patent: February 14, 2006Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., LTDInventors: Junichi Hirai, Hiroshi Arai, Tamotsu Harihara, Osamu Chiba, Masaaki Takahashi, Nobuhisa Kanamaru
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Patent number: 6934601Abstract: A numerically controlled curved-surface machining unit comprises a component converting matrix·angle-addition value forming function of converting CL (cutter location) data into components on a normal coordinate system on the basis of the machine configuration of the simultaneous multiple-axis control NC machine, a component converting function of converting from the workpiece coordinate system to the normal coordinate system, a function of forming second angles of a second rotary axis on the normal coordinate system, a compensating function of forming a continuous angle distribution from a distribution of the second angles, a function of forming first angles of a first rotary axis on a coordinate system rotated by the second angles at the second rotary axis, a compensating function of forming a continuous angle distribution from a distribution of the first angles, a machine coordinate transformation matrix forming function of obtaining a matrix for converting the tool control point vectors on the workpiece cType: GrantFiled: December 12, 2003Date of Patent: August 23, 2005Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.Inventors: Junichi Hirai, Hiroshi Arai, Tamotsu Harihara, Osamu Chiba, Masaaki Takahashi, Nobuhisa Kanamaru
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Publication number: 20050143855Abstract: When creating other tool path from two tool paths for cutting a work accurately and efficiently, the data on the first tool path is composed of a position vector and a direction vector of a tool for use when the work is cut while moving the tool. The data on the second tool path is composed of a position vector and a direction vector of the tool for use when the work, which has been cut according to the first tool path, is further cut. A computer uses the first tool path data and second tool path data to calculate a position vector and a direction vector of a medium tool path that is between the first tool path and second tool path.Type: ApplicationFiled: February 28, 2005Publication date: June 30, 2005Applicants: HITACHI, LTD., HITACHI SOFTWARE ENGINEERING CO., LTD.Inventors: Hiroshi Arai, Junichi Hirai, Tamotsu Harihara, Osamu Chiba, Nobuhisa Kanamaru, Shunsuke Minami
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Publication number: 20050055128Abstract: A numerically controlled curved-surface machining unit comprises a component converting matrix•angle-addition value forming function of converting CL (cutter location) data into components on a normal coordinate system on the basis of the machine configuration of the simultaneous multiple-axis control NC machine, a component converting function of converting from the workpiece coordinate system to the normal coordinate system, a function of forming second angles of a second rotary axis on the normal coordinate system, a compensating function of forming a continuous angle distribution from a distribution of the second angles, a function of forming first angles of a first rotary axis on a coordinate system rotated by the second angles at the second rotary axis, a compensating function of forming a continuous angle distribution from a distribution of the first angles, a machine coordinate transformation matrix forming function of obtaining a matrix for converting the tool control point vectors on the workpiece cType: ApplicationFiled: October 19, 2004Publication date: March 10, 2005Inventors: Junichi Hirai, Hiroshi Arai, Tamotsu Harihara, Osamu Chiba, Masaaki Takahashi, Nobuhisa Kanamaru
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Publication number: 20040181307Abstract: A numerically controlled curved-surface machining unit comprises a component converting matrix·angle-addition value forming function of converting CL (cutter location) data into components on a normal coordinate system on the basis of the machine configuration of the simultaneous multiple-axis control NC machine, a component converting function of converting from the workpiece coordinate system to the normal coordinate system, a function of forming second angles of a second rotary axis on the normal coordinate system, a compensating function of forming a continuous angle distribution from a distribution of the second angles, a function of forming first angles of a first rotary axis on a coordinate system rotated by the second angles at the second rotary axis, a compensating function of forming a continuous angle distribution from a distribution of the first angles, a machine coordinate transformation matrix forming function of obtaining a matrix for converting the tool control point vectors on the workType: ApplicationFiled: December 12, 2003Publication date: September 16, 2004Inventors: Junichi Hirai, Hiroshi Arai, Tamotsu Harihara, Osamu Chiba, Masaaki Takahashi, Nobuhisa Kanamaru
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Patent number: 6675061Abstract: Performing NURBS (non-uniform rational B-spline) interpolation machining is performed by reading cutter location (CL) data consisting of a tool control point vector and a tool axis vector on a workpiece coordinate system, converting the CL data into a position vector of three linear axes and a rotation angle on a machine coordinate system in accordance with the machine configuration of a simultaneous multiple-axis NC machine, calculating knot vectors of a NURBS curve with the most suitable chord length on the basis of a position vector of the three linear axes and a rotation angle, calculating a NURBS curve of the three linear axes and one rotary axis using the knot vectors, converting the NURBS curve into NURBS interpolation NC data, converting the feed rate on a workpiece coordinate system into the feed rate per minute on a machine coordinate system, and transmitting NC data to a NC machine.Type: GrantFiled: May 14, 2003Date of Patent: January 6, 2004Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.Inventors: Junichi Hirai, Hiroshi Arai, Tamotsu Harihara, Osamu Chiba, Masaaki Takahashi, Nobuhisa Kanamaru
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Publication number: 20030200005Abstract: Performing NURBS (non-uniform rational B-spline) interpolation machining is performed by reading cutter location (CL) data consisting of a tool control point vector and a tool axis vector on a workpiece coordinate system, converting the CL data into a position vector of three linear axes and a rotation angle on a machine coordinate system in accordance with the machine configuration of a simultaneous multiple-axis NC machine, calculating knot vectors of a NURBS curve with the most suitable chord length on the basis of a position vector of the three linear axes and a rotation angle, calculating a NURBS curve of the three linear axes and one rotary axis using the knot vectors, converting the NURBS curve into NURBS interpolation NC data, converting the feed rate on a workpiece coordinate system into the feed rate per minute on a machine coordinate system, and transmitting NC data to a NC machine.Type: ApplicationFiled: May 14, 2003Publication date: October 23, 2003Inventors: Junichi Hirai, Hiroshi Arai, Tamotsu Harihara, Osamu Chiba, Masaaki Takahashi, Nobuhisa Kanamaru
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Patent number: 6587747Abstract: Performing NURBS (non-uniform rational B-spline) interpolation machining is performed by reading cutter location (CL) data consisting of a tool control point vector and a tool axis vector on a workpiece coordinate system, converting the CL data into a position vector of three linear axes and a rotation angle on a machine coordinate system in accordance with the machine configuration of a simultaneous multiple-axis NC machine, calculating knot vectors of a NURBS curve with the most suitable chord length on the basis of a position vector of the three linear axes and a rotation angle, calculating a NURBS curve of the three linear axes and one rotary axis using the knot vectors, converting the NURBS curve into NURBS interpolation NC data, converting the feed rate on a workpiece coordinate system into the feed rate per minute on a machine coordinate system, and transmitting NC data to a NC machine.Type: GrantFiled: February 26, 2001Date of Patent: July 1, 2003Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.Inventors: Junichi Hirai, Hiroshi Arai, Tamotsu Harihara, Osamu Chiba, Masaaki Takahashi, Nobuhisa Kanamaru
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Publication number: 20030120375Abstract: When creating other tool path from two tool paths for cutting a work accurately and efficiently, the data on the first tool path is composed of a position vector and a direction vector of a tool for use when the work is cut while moving the tool. The data on the second tool path is composed of a position vector and a direction vector of the tool for use when the work, which has been cut according to the first tool path, is further cut. A computer uses the first tool path data and second tool path data to calculate a position vector and a direction vector of a medium tool path that is between the first tool path and second tool path.Type: ApplicationFiled: December 20, 2002Publication date: June 26, 2003Applicant: HITACHI, LTD.Inventors: Hiroshi Arai, Junichi Hirai, Tamotsu Harihara, Osamu Chiba, Nobuhisa Kanamaru, Shunsuke Minami
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Publication number: 20020002420Abstract: To provide a numerically controlled curved surface machining unit, and a method or program thereof, which, by moving a tool smoothly along a NURBS (non-uniform rational B-spline) curve, enables not only to improve the machining surface roughness and machining surface accuracy but to achieve high-speed machining so as to be able to eliminate hand finishing and reduce machining steps drastically.Type: ApplicationFiled: February 26, 2001Publication date: January 3, 2002Inventors: Junichi Hirai, Hiroshi Arai, Tamotsu Harihara, Osamu Chiba, Masaaki Takahashi, Nobuhisa Kanamaru